Ilford Ilfotec DD Developer Starter is for the Ilfotec DD Developer which is a replenishable developer for all general purpose black and white films.
Ilfotec DD concentrate is diluted 1+4 with water to prepare working strength replenisher.
For some applications this solution can be used as a developer but some adjustment to the recommended development times is required.
To make working strength Ilfotec DD developer add Ilfotec DD Starter to the working strength replenisher, 1 + 250, i.e. 4ml of starter per litre of developer required.